sendmail is not functioning on FreeBSD 5.4

[Dan O'Connor]

> Firstly, I'm sorry if this message is put in wrong mailing list.
> Normally I use sendmail to send mails from my host to other hosts.
> I can send any mails using mutt mail client to any addresses like...
> hotmail, yahoo mail, and many more without any problems.
> As now I have switched to FreeBSD 5.4-RELEASE and still use sendmail.
> I have just subscribed to freebsd-stable at freebsd.org.
> The problem is that I couldn't send any mails to 
> freebsd-stable at freebsd.org,
> while sending to other addresses is still nice on FreeBSD 5.4.
> I'm a noobie. Anyone have clues please point me out.
> Which configuration files shall I look at? Any ideas would be much
> appreciated.
> (This mail was delivered because I used web-based mail to send to same
> address)

What does the server reject message say?

Most likely, sendmail is not HELOing with an address that has a valid 
reverse-DNS lookup...

~Dan